Burner for an exhaust-gas aftertreatment system, and exhaust-gas aftertreatment system for an internal combustion engine comprising such a burner

Abstract

A burner for an exhaust-gas aftertreatment system. The burner includes a housing forming a combustion chamber, the housing having an outlet connected or connectable to an exhaust-gas line of the exhaust-gas aftertreatment system; a fuel feed device for feeding fuel into the combustion chamber; a fresh air feed device for feeding fresh air into the combustion chamber; and an ignition unit for igniting a fresh air-fuel mixture arranged in the combustion chamber. The ignition unit has a glow plug, which is arranged in the combustion chamber in such a way that a longitudinal center axis of the glow plug is oriented obliquely to a cross-sectional plane of the combustion chamber.

1 - 13 . (canceled) 
     
     
         14 . A burner for an exhaust-gas aftertreatment system, comprising:
 a housing forming a combustion chamber, the housing having an outlet connected or connectable to an exhaust-gas line of the exhaust-gas aftertreatment system;   a fuel feed device configured to feed fuel into the combustion chamber;   a fresh air feed device configured to feed fresh air into the combustion chamber; and   an ignition unit configured to ignite a fresh air-fuel mixture arranged in the combustion chamber;   wherein the ignition unit has a glow plug, which is arranged in the combustion chamber in such a way that a longitudinal center axis of the glow plug is oriented obliquely to a cross-sectional plane of the combustion chamber.   
     
     
         15 . The burner according to  claim 14 , wherein the glow plug is a ceramic glow plug. 
     
     
         16 . The burner according to  claim 14 , wherein an angle between the longitudinal center axis of the glow plug and the cross-sectional plane of the combustion chamber is between 20° and 80°. 
     
     
         17 . The burner according to  claim 14 , wherein an angle between the longitudinal center axis of the glow plug and the cross-sectional plane of the combustion chamber is between 50° and 80°. 
     
     
         18 . The burner according to  claim 14 , wherein the glow plug is oriented in such a way that the longitudinal center axis of the glow plug and a longitudinal center axis of the combustion chamber lie in a common imaginary plane. 
     
     
         19 . The burner according to  claim 14 , wherein the ignition unit has a spark plug fluidically connected downstream of the glow plug. 
     
     
         20 . The burner according to  claim 14 , wherein the ignition unit has a tunnel-shaped first air guide element, and the glow plug extends at least in portions through the first air guide element. 
     
     
         21 . The burner according to  claim 20 , wherein the first air guide element has a first side wall and a second side wall arranged at a distance from the first side wall in a circumferential direction of the combustion chamber, wherein the first and second side walls each have a first end facing away from the outlet, and wherein the first end of the first side wall is at a greater distance from the outlet than the first end of the second side wall is from the outlet. 
     
     
         22 . The burner according to  claim 20 , wherein the ignition unit has a second air guide element having a ramp surface oriented obliquely to the cross-sectional plane of the combustion chamber, and in that the glow plug extends at least in portions along the ramp surface. 
     
     
         23 . The burner according to  claim 22 , wherein the ignition unit has a carrier which is arranged in an opening of a housing wall of the housing, and the glow plug and/or the spark plug and/or the first air guide element and/or the second air guide element are arranged on the carrier. 
     
     
         24 . The burner according to  claim 23 , wherein the first air guide element and/or the second air guide element are formed in one piece with the carrier. 
     
     
         25 . The burner according to  claim 14 , wherein the fuel feed device and the fresh air feed device together form a two-fluid nozzle. 
     
     
         26 . The burner according to  claim 14 , wherein the fresh air feed device has a sleeve-shaped fresh air feed chamber, wherein the fresh air feed chamber radially encloses the housing, and wherein the ignition unit protrudes radially through the fresh air feed chamber. 
     
     
         27 . An exhaust-gas aftertreatment system for an internal combustion engine, comprising:
 a burner for the exhaust-gas aftertreatment system, including:
 a housing forming a combustion chamber, the housing having an outlet connected or connectable to an exhaust-gas line of the exhaust-gas aftertreatment system; 
 a fuel feed device configured to feed fuel into the combustion chamber; 
 a fresh air feed device configured to feed fresh air into the combustion chamber; and 
 an ignition unit configured to ignite a fresh air-fuel mixture arranged in the combustion chamber; 
 wherein the ignition unit has a glow plug, which is arranged in the combustion chamber in such a way that a longitudinal center axis of the glow plug is oriented obliquely to a cross-sectional plane of the combustion chamber.